<html>
<head>
<title></title>
<link href="http://cdn.bootcss.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="stylesheet"></head>
<body>
<h2>hello, upload </h2>
<form action="/upload" method="post" enctype="multipart/form-data">
    <input type="hidden" value="{{.}}">
    <input type="file" name="uploadfile">
    <input type="submit" value="提交">
</form>
</body>
</html>